摘要:以成都云顶山5种人工林（Ⅰ：柏木枫杨林；Ⅱ：银杏楠木林；Ⅲ：光皮梾木香樟林；Ⅳ：枫杨桤木林；Ⅴ：柏木林）为研究对象，重点研究不同人工林林下植物多样性与土壤理化性质差异以及二者间的关系。结果表明：不同人工林灌草层重要值最高的物种不同，光皮梾木香樟林林下植物组成最丰富，而银杏楠木林最贫乏。各人工林灌木层多样性指数H、优势度指数H'、丰富度指数D均以光皮梾木香樟林最大，而均匀度指数J_sw无显著差异；草本层H、D、J_sw均以柏木林最大，银杏楠木林最小，而H'差异不显著。不同人工林土壤pH值、有机质、全氮、全磷、速效钾、速效磷含量差异显著，pH值、全磷含量柏木枫杨林最高，有机质、全氮、速效钾、速效磷含量银杏楠木林最高。显著影响灌木层物种多样性的土壤因子为有机质、速效磷，草本层为pH、全磷、速效磷。结论：光皮梾木香樟林林下整体植物多样性水平最高，经营此种林分有利于林下植物多样性维持及发展，pH、有机质、全磷、速效磷是影响研究区林下植物多样性的主要土壤因子。



Abstract:Five plantations (Ⅰ: Cupressus funebris and Pterocarya stenoptera forest; Ⅱ: Ginkgo biloba and Phoebe zhennan forest; Ⅲ: Swida wilsoniana and Cinnamomum camphora forest; Ⅳ: Pt. stenoptera and Alnus cremastogyne forest; Ⅴ: Cu. funebris forest) were utilized in the Yunding Mountain, Chengdu, as the research objects to focus on the differences between understory plant diversity and soil physicochemical properties and the relationship between them. The results showed that the species with the highest important values in the shrub and herb layer of five plantations were different. S. wilsoniana and Ci. camphora forests had the richest understory plant composition whereas G. biloba and Ph. zhennan forests had the poorest. In the shrub layer, the Shannon-Wiener diversity index H, Simpson dominance index H', and species richness index D of the different plantations were the largest in the S. wilsoniana and Ci. camphora forests, whereas the Pielou evenness index J_sw showed no significant difference. In the herb layer, the H, D, and J_sw among the different plantations were the largest in the Cu. Funebris forest and the smallest in the G. biloba and Ph. zhennan forests, whereas the difference of the H' in the different plantations was not significant. There were visible differences in the soil pH value and contents of organic matter, total nitrogen, total phosphorus, available potassium, and available phosphorus in the different plantations. The pH value and total phosphorus contents were the highest in the Cu. funebris and Pt. stenoptera forests, and the organic matter, total nitrogen, available potassium, and available phosphorus contents were the highest in the G. biloba and Ph. zhennan forests. The soil factors that significantly affected the species diversity of the shrub layer were the organic matter and available phosphorus, whereas in the herb layer these factors were the pH, total phosphorus, and available phosphorus. In summary, the overall levels of understory plant diversity under S. wilsoniana and Ci. camphora forests were the highest; therefore, the construction of such a plantation is conducive to the maintenance and development of understory plant diversity. Meanwhile, soil pH, organic matter, total phosphorus, and available phosphorus were the main soil factors influencing the understory plant diversity in the study area.





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